/* identity-based signature test program * Ben Lynn *//*Copyright (C) 2001 Benjamin Lynn (blynn@cs.stanford.edu)See LICENSE for license*/#include "ibe.h"int main(){    params_t params;    byte_string_t priv, pub;    byte_string_t priv2, pub2;    byte_string_t sig;    byte_string_t message;    byte_string_t master;    byte_string_t cert, cshare[2];    byte_string_t mshare[2];    char *id = "test";    IBE_init();    IBE_setup(params, master, 512, 160, "test");    IBE_keygen(priv, pub, params);    IBE_keygen(priv2, pub2, params);    byte_string_set(message, "Hello, World");    //Rather than work out the certifcate directly from the master key,    //I'll demonstrate how secret sharing works.    //This is done so that an attacker must compromise all the servers in    //order to break the system.    //During setup the master key is split into two pieces    //One server guards mshare[0], and the other guards mshare[1]    IBE_split_master(mshare, master, 2, 2, params);    //The user then requests a certificate share from each server    IBE_certify_share(cshare[0], mshare[0], pub, id, params);    IBE_certify_share(cshare[1], mshare[1], pub, id, params);    //...and combines them to get a full certificate on their public key    IBE_combine(cert, cshare, params);    IBE_sign(sig, message, priv, cert, params);    printf("Sig: ");    byte_string_fprintf(stdout, sig, " %02X");    printf("\n");    if (IBE_verify(sig, message, pub, id, params)) {	printf("signature verifies\n");    } else {	printf("bug: signature does not verify\n");    }    if (IBE_verify(sig, message, pub2, id, params)) {	printf("bug: signature verifies with wrong public key\n");    }    params_clear(params);    byte_string_clear(pub2); byte_string_clear(priv2);    byte_string_clear(pub); byte_string_clear(priv);    byte_string_clear(cert);    byte_string_clear(cshare[0]);    byte_string_clear(cshare[1]);    byte_string_clear(master);    byte_string_clear(mshare[0]);    byte_string_clear(mshare[1]);    byte_string_clear(message);    byte_string_clear(sig);    IBE_clear();    return 0;}